README: fixed command-line args in examples

Modified examples to use `--couch` instead of `--couchdb` parameter.
Merge pull request #5 from bajtos/docfix

README: fixed command-line args in examples
bump request dep to latest
Merge pull request #6 from isaacs/master

Bump request dep to latest
bump 0.4.1
Implemented creation of empty index if needed.

Modified code to check if the index exists and create a new empty index
if it doesn't. This way synchronization works even if auto-index-creation
is turned off and also the ES index is created even in case there are
no packages in NPM registry (yet).
test: added test for creation of an empty index
Update README.md
make tests work with couchdb 1.3.0 as well (fixes #8)
Land: Create index if needed
bump (0.4.2)